Magneto-electric machine.



APPLICATION FILED AUG.25. I917.

Patented Apr. 22, 1919.

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IBERTRAM JOHN TURNER, OF NEW SOUTHGA'I'E, LONDON, ENGLAND.

MAGNETO-ELEGTRIG MACHINE.

Specification of letters Patent.

Patented Apr. 22, 1919.

Application filed August 25, 1917. Serial No. 188,241.

To all whom it may concern.

Be it known that I, BERTRAM J OHN TURNER, a subject of the King of Great Britain and Ireland, residing at 62 Warwick road, New Southgate, London, N., England, have invented certain new and useful Improvements Relating to Magneto-Electric Machines, of which the following is a specification.

This invention relates to magneto-electrio machines of the kind commonly used for ignition in internal combustion engines.

The contacts for such magnetoaelectric machines frequently operate in situations where they are exposed to the deposits of foreign matter and the invention has for its object to shield the plunger contact with a view to prevent or minimize such deposits.

According to the invention thefitting is provided with an insulating tube the lower end of which is outwardly extended to form a shield.

The invention is illustrated by way of example in the accompanying drawings in which- Figure 1 represents in elevation a contact fitting according to the invention.

Fig. 2 is a sectional elevation corresponding to Fig. 1, and

Fig. 3 is a corresponding plan.

In carrying the invention into effect as illustrated in the accompanying drawings, the metal tubular contact fitting a is provided at its extremity with a screw threaded pin 6 upon which is mounted the contact screw 0 and the tubular fitting a is mounted in position by means of a flange d of vulcanized fiber or other suitable insulating material.

According to the invention a tubular sleeve 6 of vulcanite or other suitable insulating material is provided as a plunger having secured within it at one end a plug 7 outwardly forcing the insulating tube e and.

of carrying the tube by the engagement with the groove f in the plu The spiral spring h is mounted within the insulating tube 6 and at one end engages the groove f in the plug f while at the other the spiral spring 72, engages the groove 71 provided in the upper part of the cylindrical contact pin 2'. The lower end of the insulating tube 6 protrudes downwardly and outwardly to cover over and to shield the lower end of the contact pin 2'.

The spiral spring it within the insulating tube 6 outwardly forces the contact pin 71 intocontact with the metal contact plate or surface while the insulating tube e surrounding the contact pin 2' is independently pressed down so as thus to cover up and to shield the metal contact plate so that thus the contact in i and the metal plate are shielded without lessening the efiectiveness of the contact.

The invention is more especially applicable to magneto-electric machines of the Ford type but it is of general application.

I claim In magneto-electric machines, a contact fitting, comprising an insulating tube, a spiral spring by which said insulating tube is outwardly thrust, a contact pin carried at the end of the said insulating tube, a second spiral spring by which the said contact pin is outwardly thrust, said insulating tube be ing provided with an extending flange at its outer end to cover and to shield the contact pin and the contact surface, substantially as described.

BERTRAM JOHN TURNER.

Copies of this patent may be obtained for five cents each, by addressing the commissioner of Patents, Washington, D. G." 

